#include "driver.h" UINT8 *wc90b_fgvideoram,*wc90b_bgvideoram,*wc90b_txvideoram; UINT8 *wc90b_scroll1x; UINT8 *wc90b_scroll2x; UINT8 *wc90b_scroll1y; UINT8 *wc90b_scroll2y; UINT8 *wc90b_scroll_x_lo; static tilemap *tx_tilemap,*fg_tilemap,*bg_tilemap; /*************************************************************************** Callbacks for the TileMap code ***************************************************************************/ static TILE_GET_INFO( get_bg_tile_info ) { int attr = wc90b_bgvideoram[tile_index]; int tile = wc90b_bgvideoram[tile_index + 0x800]; SET_TILE_INFO( 9 + ((attr & 3) + ((attr >> 1) & 4)), tile, attr >> 4, 0); } static TILE_GET_INFO( get_fg_tile_info ) { int attr = wc90b_fgvideoram[tile_index]; int tile = wc90b_fgvideoram[tile_index + 0x800]; SET_TILE_INFO( 1 + ((attr & 3) + ((attr >> 1) & 4)), tile, attr >> 4, 0); } static TILE_GET_INFO( get_tx_tile_info ) { SET_TILE_INFO( 0, wc90b_txvideoram[tile_index + 0x800] + ((wc90b_txvideoram[tile_index] & 0x07) << 8), wc90b_txvideoram[tile_index] >> 4, 0); } /*************************************************************************** Start the video hardware emulation. ***************************************************************************/ VIDEO_START( wc90b ) { bg_tilemap = tilemap_create(machine, get_bg_tile_info,tilemap_scan_rows, 16,16,64,32); fg_tilemap = tilemap_create(machine, get_fg_tile_info,tilemap_scan_rows,16,16,64,32); tx_tilemap = tilemap_create(machine, get_tx_tile_info,tilemap_scan_rows, 8, 8,64,32); tilemap_set_transparent_pen(fg_tilemap,15); tilemap_set_transparent_pen(tx_tilemap,15); } /*************************************************************************** Memory handlers ***************************************************************************/ WRITE8_HANDLER( wc90b_bgvideoram_w ) { wc90b_bgvideoram[offset] = data; tilemap_mark_tile_dirty(bg_tilemap,offset & 0x7ff); } WRITE8_HANDLER( wc90b_fgvideoram_w ) { wc90b_fgvideoram[offset] = data; tilemap_mark_tile_dirty(fg_tilemap,offset & 0x7ff); } WRITE8_HANDLER( wc90b_txvideoram_w ) { wc90b_txvideoram[offset] = data; tilemap_mark_tile_dirty(tx_tilemap,offset & 0x7ff); } /*************************************************************************** Display refresh ***************************************************************************/ static void draw_sprites(running_machine *machine, bitmap_t *bitmap, const rectangle *cliprect, int priority ) { int offs, sx, sy; /* draw all visible sprites of specified priority */ for ( offs = spriteram_size - 8 ; offs >= 0 ; offs -= 8 ) { if ( ( ~( spriteram[offs+3] >> 7 ) & 1 ) == priority ) { int code = ( spriteram[offs + 3] & 0x3f ) << 4; int bank = spriteram[offs + 0]; int flags = spriteram[offs + 4]; code += ( bank & 0xf0 ) >> 4; code <<= 2; code += ( bank & 0x0f ) >> 2; sx = spriteram[offs + 2]; if (!(spriteram[offs + 3] & 0x40)) sx -= 0x0100; sy = 240 - spriteram[offs + 1]; drawgfx( bitmap, machine->gfx[17], code, flags >> 4, /* color */ bank & 1, /* flipx */ bank & 2, /* flipy */ sx, sy, cliprect,TRANSPARENCY_PEN,15 ); } } } VIDEO_UPDATE( wc90b ) { tilemap_set_scrollx(bg_tilemap,0,8 * wc90b_scroll2x[0] + 256 - 4 + (wc90b_scroll_x_lo[0] & 0x07)); tilemap_set_scrolly(bg_tilemap,0,wc90b_scroll2y[0] + 1 + ((wc90b_scroll2y[0] < 0x10 || wc90b_scroll2y[0] == 0xff) ? 256 : 0)); tilemap_set_scrollx(fg_tilemap,0,8 * wc90b_scroll1x[0] + 256 - 6 + ((wc90b_scroll_x_lo[0] & 0x38) >> 3)); tilemap_set_scrolly(fg_tilemap,0,wc90b_scroll1y[0] + 1 + ((wc90b_scroll1y[0] < 0x10 || wc90b_scroll1y[0] == 0xff) ? 256 : 0)); tilemap_draw(bitmap,cliprect,bg_tilemap,0,0); tilemap_draw(bitmap,cliprect,fg_tilemap,0,0); draw_sprites(screen->machine, bitmap,cliprect, 1 ); tilemap_draw(bitmap,cliprect,tx_tilemap,0,0); draw_sprites(screen->machine, bitmap,cliprect, 0 ); return 0; }